1. Start the app
2. Select contacts you want to merge.Make sure the first contact you select is the one where you want other contacts to merge (first selection serves as the primary contact for merge)
3. Once selection is done, tap menu in top-right. Tap 'Merge'
4. You will get a confirmation dialog. Tap 'Yes'
5. Merge will start
6. Once merge is done, the contact information will come up showing all merged contact details under the primary contact
7. You can merge other contacts this way by repeating steps 2-4